Why do ice cubes make a popping sound when in contact with warm or hot liquids?
Answer:
The popping sound is the noise you hear when the ice crystal fractures (cracks). This happens because the outside is suddenly heated and expands, but the inside is still cold (heat doesn't flow instantly; it takes time) and remains close to the original volume. The stress from the portions of the ice cube that want to slide against each other (but can't; the molecules are still "trapped" in the solid structure) will build up until a sudden "slip" of layers of frozen water molecules happens -- the crack forms, you hear a "pop".
Observe the ice cube carefully just after dropping it in the warmer liquid, and you'll even see the crack appear, along with the popping sound.
Exactly as she said. The "pop" noise, is caused by the warm liquid expanding the ice to a crack. When the ice cracks it creates this popping noise.
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